Kinetic Alfvén waves in the magnetotail during substorms

Duan, Suqing; Dai, Lei; Wang, Chi

doi:10.1007/s41614-022-00100-5

Cited by 8 publications

(12 citation statements)

References 129 publications

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“…All these features, including wave-frequency range, wave phase speed, quasi-perpendicular propagation, k ⊥ /k ∥ ? 1, k ⊥ d > 1, and polarization manifest that the waves in this event are KAWs(Wu & Chao 2004;Duan et al 2022). These analysis results suggest that KAWs can exist and propagate behind DFs.To investigate the dispersion relation (ω-k relation) of these KAWs behind the DF, here we perform a dispersion relation from timing (DRAFT) analysis(Zhang et al 2022) from 12:38:15 to 12:39:15 UT, where the phase speed and wavevector were calculated at each time for each singlefrequency wave in the range from zero to Nyquist frequency.…”

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confidence: 89%

“…Kinetic Alfvén waves (KAWs)-dispersive shear Alfvén fluctuations modified by short wavelength effects-have also been widely detected in the terrestrial magnetotail accompanied with parallel electric field (Wu & Chao 2004;Duan et al 2022). Such waves, characterized by a comparable perpendicular wavelength to the ion thermal gyroradius (Louarn et al 1994;Wygant et al 2002;Salem et al 2012;Zhao et al 2014), have long been proposed to be responsible for forming turbulence (Sahraoui et al 2010;Zhang et al 2023) and triggering magnetic reconnection (Rogers et al 2001;Dai 2009;Dai et al 2017), and provide a potential approach for energy exchange between electromagnetic fields and plasma particles (Johnson & Cheng 1997;Liu et al 2023).…”

Section: Introductionmentioning

confidence: 99%

“…Although DFs and KAWs have been widely studied respectively (Hollweg 1999;Wu & Chao 2004;Fu et al 2020bFu et al , 2022, the relation between them in spacecraft observation is still unclear. In other words, despite the wide presence of both DFs and KAWs in the magnetotail (Fu et al 2012a;Duan et al 2022), whether KAWs can exist and propagate behind DFs is still in mystery. To answer this question, identifying the wave mode (dispersion relation) by spacecraft measurements is necessary.…”

Section: Introductionmentioning

confidence: 99%

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First Observation of Kinetic Alfvén Waves behind Reconnection Front in Terrestrial Magnetotail

Wang,

Liu,

et al. 2023

ApJ

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Reconnection fronts, also known as dipolarization fronts (DFs), and kinetic Alfvén waves (KAWs) are two of the widely observed structures and waves in the terrestrial magnetotail, but their correlation remains elusive in previous spacecraft measurements. Using high-resolution Magnetospheric Multiscale data, here we provide the first observational identification of KAWs behind the DF. These low-frequency dispersive KAWs propagate quasi-perpendicular to the magnetic field at phase speeds slower than local Alfvén speed, and are highly correlated with high-frequency whistlers propagating obliquely to the magnetic field. Specifically, whistlers appear at local magnetic field minima (wave troughs of KAWs) and disappear at local magnetic field maxima (wave crests of KAWs), highly consistent with the source region of whistler waves previously reported near equator and dayside magnetopause. Our study also suggests that the KAWs behind DFs could originate from the diffusion region of magnetic reconnection. These findings improve our understanding of the relationship between DFs, KAWs, and whistler waves in terrestrial magnetotail.

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confidence: 89%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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First Observation of Kinetic Alfvén Waves behind Reconnection Front in Terrestrial Magnetotail

Wang,

Liu,

et al. 2023

ApJ

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“…Topical collection "Kinetic Alfvén waves in space, solar, and laboratory plasmas(KAW)" is organized by Yu Lin, Fulvio Zonca, De-Jin Wu selected from CD (Kinetic Alfvén Wave) speakers in AAPPS-DPP2021 and published one article in 2022 (Duan et al 2022).…”

Section: Volume 6 Publicationmentioning

confidence: 99%

Editorial : Reviews of Modern Plasma Physics: Volume 6

Kikuchi

2023

Rev. Mod. Plasma Phys.

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“…These instabilities are referred to as double tearing mode (DTM). [7][8][9][10][11][12][13] Ishii et al conducted numerical research on the nonlinear evolutions of DTM instabilities for 𝑞-profiles with different separations (Δ𝑟s) between the two rational surfaces. [14,15] In their research, they found that in the case of large Δ𝑟s, two single tearing modes with weak coupling effects saturate separately, while in the case of small Δ𝑟s, strongly coupled DTMs with fast linear growth rates eventually reach saturation at low levels of perturbation energy.…”

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confidence: 99%

Effects of Plasma Boundary Shape on Explosive Bursts Triggered by Tearing Mode in Toroidal Tokamak Plasmas with Reversed Magnetic Shear

Wang

Liu

et al. 2023

Chinese Phys. Lett.

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Numerical research is conducted to investigate the effects of plasma boundary shape on the tearing mode triggering explosive bursts in toroidal tokamak plasmas. In this work, m/n = 2/1 mode is responsible for the triggering of the explosive burst. Plasma boundary shape can be adjusted via the adjustment of the parameters triangularity δ and elongation κ. The investigations are conducted both under low β (close to zero) and under finite β regimes. In the low β regime, triangularity and elongation both have stabilizing effect on the explosive burst and the stabilizing effect of elongation is stronger. Under a large elongation (κ = 2.0), the elongation effect can evidently enhance the stabilizing effect in a positive triangularity regime, but barely affects the stabilizing effect in a negative triangularity regime. In the finite β regime, the explosive burst is delayed in comparison with that in the low β regime. Similar to the low β cases, the effects of triangularity and elongation both are stabilizing. Under a large elongation (κ = 2.0), the elongation effect can evidently enhance the stabilizing effect on the explosive burst in a positive triangularity regime, but impair the stabilizing effect in a negative triangularity regime. The explosive burst disappears in the large triangularity case (δ = 0.5), indicating that the explosive burst can be effectively prevented in experiments via carefully adjusting plasma boundary shape. Moreover, strong magnetic stochasticity appears in the negative triangularity case during the nonlinear phase.

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Kinetic Alfvén waves in the magnetotail during substorms

Cited by 8 publications

References 129 publications

First Observation of Kinetic Alfvén Waves behind Reconnection Front in Terrestrial Magnetotail

First Observation of Kinetic Alfvén Waves behind Reconnection Front in Terrestrial Magnetotail

Editorial : Reviews of Modern Plasma Physics: Volume 6

Effects of Plasma Boundary Shape on Explosive Bursts Triggered by Tearing Mode in Toroidal Tokamak Plasmas with Reversed Magnetic Shear

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